Brake-shoe.



PATENTED-IJULY 14, 1908.

U. D. PETTIS.

BRAKE SHOE. APPLIOATIOE FILED APR. 9, 190e,

w 1 3 W W W I x 7a m 3/37 H forme the shoe, is 'to bring these ribs opposite those thus more Fig. 5 is a view in transverse section'on .two parts, viz: the'back portion 8 and a PA'IE1\T OFFICE.-

GLIFTON D. PETTI S; OF CHICAGO, ILLINOIS.

BRAKE-SHOE No. 898,260. Specification of Letters Patent. Patented July 14, 1908.

Application filed April 9,1908. Serial No. 426,031.

To all whom Be it known that I, CLIFTON D. Pn'rris, a

citizen of the United States, and a resident of Chicago, county of Cook, and. State of Illinois, have invented certain new and useful Improvements in Brake-Shoes, of which I do declare the following to be a full, clear, and

accompanying drawing, specification. I This invention relates more particular to that classof brake shoes for railway roll ing stock commonly known as composite brake shoes, and the invention has for its object to produce a composite shoe of increased 1 strengt 1 and durability. j

The invention consists the features of construction hereinafter described, illustrated in the accompanying drawing and particularly pointed-out in. the claims at the end of this specification. f f Figure 1 is .aview in side jelevationof a brake shoe embod ing mv -invention. Fig. .2 is a view in elevation of the backof the shoe; the view beingtaken from-the wearing sideof the shoe. Fig. 3 is a viewin transverse section on line 33 of 1. Fig. 4 is a view in transverse section on line 44 of forming v5-5 of Fig. 1. I I

My improved brakes-hoe is composed of front ortion .9, both of these parts being I d of cast metal: The frdnt portion 9 is formed of cast iron of a quality such as is ordinarily employed in the manufacture of cast iron brake shoes. The back portion '8 is formed of a cast metal ofgreater tensile strength than thefront portion, and for this purpose I prefer to employ. what is commonly nown as semi-steel.

In the finished shoe the back portion 8 has its front or wearing face formed with the ribs or strips 10 that approach each other at the central portion of the shoe and diverge thence towards the ends of the shoe, as seen in Fig. 2 of the drawing, and along each side of the back portion 8 extend theribs orstrips 11 which at their ends merge into the-ends of the diverging ribs 10, as shown at 12 in 2. My, purpose in forming the wearing face of the back portion 8 with the ribs 10 which approach each other at the central portion of the shoe and diverge thence to the endsof' part of this 1 leap iiwhich are formed on the back of the i l portions of the shoe that are subjected to the l greatest strain.

By reference to Figs. 1 and 2'of the drawl ing, there will be seen in dotted lines the position of the brake-head 14, the central lugs I? of which bear upon the brake shoe at each side ofits key lug 13 and the end lugs of this exact description, reference being had to the bmK 'loe-ad bear upon the end portions of the as at 16, at each sidc'of the end guide choc, By '-tl1is arrangement of the ribs 1 0 they are brought immediately opposite those portions of the brake-head that bear upon the shoe, and,,hence, are in position to most effectively resist the thrusts and strains exerted upon the shoe by the brake-head. i

The side or marginal ribs 11 that project from the wearin side of the back portion 8, are sodisposed that inthe finished-shoe they are practically flush witlrthe sides of the cast iron portion '9. The lug 13 that projects from the back portion of the shoe, is formed integral therewith and is furnished with the head.

In the preferred embodiment of my invention, the ribs 10 and 11 are considerably deeper, i. 6., from front to back, at their central portions than at their ends, this feature being clearly shown in Fig. 1 and in the several sectional views of the drawing, the purpose of this bein to give to the central portions of the s oe the greatest possible like reason, the body of the back portion 8 is preferably formed somewhat thicker about its central portion than towards the ends of the shoe.

In forming my improved shoe, the front portion 9 is referably first cast so as to for'rn upon its bac a central rib 9 that is narrowis flarin or broadest at the ends of the shoe, and wit the shorter ribs 9* at the sides of the central rib 9. has beenthus formed it is set in a mold and portion 9. There are several material advantages incident to casting the back por of the back ortion as it cools will shrink and y bind ppon and adhere to usual key-way for attachment to the brake est along the central portion of the shoe and After the front portion 9.

the back portion 8 is'thcn cast onto the front tion onto the front ortion, as I prefer to do.

In the first place, w on the back portion 8 is thus east onto the front-portion 9, the metal strength, as it is to such portions of the shoe that the greatest strains are applied.- For tensile stren It is manifest thatithe,

. y e m loyed without'its'adoptionas an, .uffintll'ety f1; 1, I

strength, 'durabilityand effectiveness to the metal'back portion united to s the ribs on the back of the front portion 9, so that when the shoe is finished, its front and back portions are inseparably connected together throughout the life of the shoe. Again, as the back portion of the shoe is cast onto the front portion, the metal that. will forni the ribs 10 and 11, as well as the metal nearest the front portion of the shoe, will be chilled more or less, thus incneasingthe effic'iency and durability ofsuch parts. From the drawin it will be understood that the ribs 9 am? 9 at'the back of the front portion 9 fill the spaces between the ribs'lO and 11 of the back portion 8, and the shape of the ribs Q -and 9 is such as to effectively distribute the metal of the front portion of the shoe, even after the main body of this front portion Qhas become worn away. The construction of the back portion, as above described, and of a "metal of 'greater th than that of which the frontportion of t e shoe is formed, gives great.

shoe and permits it-to be serviceable until the ribs upon its wearing'side i have been worn away, or even longer;

construction above set, out m'a'y be varied without departure from the ,spirt of the invention, and "that, featureseof. the{invention i what I claun'as new, and desire-to secure by Let/ ters Patent,'is m r 4 1., A brake sh'oe of the character described, comprising a cast metal front portion having a ribbed' or offset back, and a cast metal backportion united to and shrunk upon said front portion in the castin" operation. 2. A brake shoe 0 the character described,

comprising a castmetal front portion having longitudinal. ribs upon its back and a cast aid front portion in the casting operation;

3. Avbrake shoe. of the character described,

comprisin a'cast metal front portion and a cast meta back 'portiomsaid front portion :cast me back portion having its wearing s front portion being front portion being having marginal ribs and being united to and shrunkupon said front portion in the casting operation.

4. A brake shoe of the character described, comprising a cast metal front portion and a cast metalback portion united together in' the casting operation, said back portion be-' ing provided upon its wearing side with longitudinal ribs nearest each other at the central portion of the shoe and divergin thence towards the ends of the shoe, and t e front portion of the shoe having a longitudinal rib or part filling the spaces between said ribs of the back portion. l

5. A brake shoe of the character described, comprising a cast metal front ortion and a cast metal back portion, sai parts bein united together in the casting operation, said back portion having its'body thicker (from front to back) about its center than adjacent its ends. v

6. A brake shoe of the character described, compris' a cast .metal front ortion and a :25 back portion, sai parts bein united together in the casting operation, sai

ide provided with projecting ribs thatare deepest about its central portionv and. tapering thence towards the ends of the shoe. v

7. r A'brake shoeof the character described,

comprisin a cast metal front ortion-and a oast. meta back-portion, sai parts being unitedtogether in the castingoperation, said of the shoe and flaring at itsends. 8. A brake shoe of the character described,

provided upon its back vwith'a central rib narrowest about the center oomprisin acast metal front ortion and a cast meta backportion, sai unitedtogether in the casting operation, said provided u on itsback with a'central longitudinal rib aving laterally flaring ndsand with shorter ribs at the sides. of said central rib.

' CLIFTON D. PET'ITIS. Witnesses:

GEO. P. FISHER, Jr.,

THARINE GERLACH.

parts being i 

